Clean up src/ file headers

[davidharrishmc]

Builds on #1950 (license trim); merge that first so this PR shows only its own changes.

For every .sv file in src/:

• Correct the filename line (about 20 were wrong or missing).
• Written: original author(s), checked against git history (following renames and copies by hand where git --follow was misled by identical license text). Every author is listed by name. An email address appears only where that file's header already had it; none are added from commit metadata or copied from other files. Existing authors are kept where history predates the January 2021 import.
• Modified: people who made functional changes to that file; whitespace, comment, lint, rename, and tree-wide mechanical commits don't count.
• Purpose: one clear sentence, with important caveats (unsupported features, spec references) kept on the following lines.
• Copyright: <creation year>-26 Harvey Mudd College & Oklahoma State University.
• The six MIT-licensed files (binencoder, decoder, priorityonehot, prioritythermometer, hptw, privileged) keep their MIT notice unchanged.

Header comments only; no code changes. #1950's trim also touches the four modules #1952 deletes, so whichever of #1952 and this PR merges second resolves four trivial modify/delete conflicts.

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[davidharrishmc]

Review notes: no code changes (token streams match main in every file), but two licensing questions need sign-off before merging:

• Future copyright year. 222 of 226 src headers now read Copyright (C) <year>-27 (e.g. src/ieu/controller.sv:15 2021-27). 2027 hasn't happened; main uses -23/-24, and the current year would be -26. If -27 is deliberate, say so in the body.
• Relicensing MIT files. It changes 6 MIT-licensed files to Apache-2.0 WITH SHL-2.1, not the 5 the body lists: src/generic/{binencoder,decoder,priorityonehot,prioritythermometer}.sv, src/mmu/hptw.sv, src/privileged/privileged.sv. MIT requires keeping its notice unless the copyright holder relicenses; HMC/OSU are the named holders, but hptw.sv and privileged.sv have outside contributors. This is better as its own commit or PR with an explicit ack.
• The body says files deleted in Clean up comments and whitespace in src/; delete unused modules #1952 are untouched, but the contained Trim license boilerplate to the SPDX identifier #1950 commit edits them, causing 4 modify/delete conflicts with Clean up comments and whitespace in src/; delete unused modules #1952. It also conflicts with Clean up comments and whitespace in src/; delete unused modules #1952 in spi_fifo.sv. The body says to review only the last commit, but there are 3 commits on top of Trim license boilerplate to the SPDX identifier #1950.
• Headers now include personal email addresses taken from git history (e.g. src/mmu/tlb/tlbcamline.sv:5); some contributors may prefer name-only.

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[davidharrishmc]

Merge order: contains #1950. Merge #1950 first, or close it in favour of this PR. It has trivial conflicts with the #1952 stack: 4 modify/delete conflicts, plus one in spi_fifo.sv.

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[davidharrishmc]

Updated per review:

• Email addresses: an address stays only where that file's header on main already had it; everywhere else the author is listed by name. This removes 323 addresses from 149 headers, including those taken from commit metadata (institutional and personal) and those copied from other files into files that never had them.
• Licensing: the six MIT files (binencoder, decoder, priorityonehot, prioritythermometer, hptw, privileged) keep main's MIT notice unchanged, with no SPDX line added. The description had said five files.
• Merged the updated Trim license boilerplate to the SPDX identifier #1950, which includes current main. The PR is still comment-only: with comments and whitespace stripped, every file matches main.
• Still open: the -27 end year in the copyright lines is unchanged pending a decision.

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[davidharrishmc]

Copyright end years changed from -27 to -26 in all 222 headers the PR touches (2026 alone in pwm_apb.sv, whose start year is 2026); still comment-only.

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